Please read the input file description with 'lifc' variable below;
Variable: lifc
Type: LOGICAL Default: .false. Description: If .true. uses the real-space inter-atomic force constant generated by q2r.x. The resulting file must be named "ifc.q2r". The file has to be placed in the same directory as the dvscf files. In the case of SOC, the file must be named "ifc.q2r.xml" and be in xml format. See asr_typ for the type of acoustic sum rules that can be imposed.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Error in routine epw_readin (1): must use same w90 rotation matrix for entire run %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%